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The offender then fled across the car park and into nearby side streets, police said. The victim was not believed to have been armed.

Detective Senior Sergeant David Snare said Haiming Chen - who is known by a number of aliases including Jing Chen, Xin Chen and Yin Chen - was pictured in CCTV footage at the station on the morning of the attack.

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He is described as Asian with collar-length black hair which is spiked at the front, a medium build and average height.

"We're hoping someone in the community, particularly Melbourne's Chinese community, will know where Haiming Chen is and pass on this information,” Senior Sergeant Snare said.

“I'd urge anyone with further information to come forward and contact Crime Stoppers, this can be done anonymously.”

Anyone with information has been urged to contact CrimeStoppers on 1800 333 000 or visit www.crimestoppers.com.au